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Simplifying 5 + -3(7 + -3x) = 9(x + -1) 5 + (7 * -3 + -3x * -3) = 9(x + -1) 5 + (-21 + 9x) = 9(x + -1) Combine like terms: 5 + -21 = -16 -16 + 9x = 9(x + -1) Reorder the terms: -16 + 9x = 9(-1 + x) -16 + 9x = (-1 * 9 + x * 9) -16 + 9x = (-9 + 9x) Add '-9x' to each side of the equation. -16 + 9x + -9x = -9 + 9x + -9x Combine like terms: 9x + -9x = 0 -16 + 0 = -9 + 9x + -9x -16 = -9 + 9x + -9x Combine like terms: 9x + -9x = 0 -16 = -9 + 0 -16 = -9 Solving -16 = -9 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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